/**
 * @license Copyright (c) 2003-2023, CKSource Holding sp. z o.o. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */
import { isSingleParagraphWithoutAttributes } from './downcast';
/**
 * A table cell refresh handler which marks the table cell in the differ to have it re-rendered.
 *
 * Model `paragraph` inside a table cell can be rendered as `<span>` or `<p>`. It is rendered as `<span>` if this is the only block
 * element in that table cell and it does not have any attributes. It is rendered as `<p>` otherwise.
 *
 * When table cell content changes, for example a second `paragraph` element is added, we need to ensure that the first `paragraph` is
 * re-rendered so it changes from `<span>` to `<p>`. The easiest way to do it is to re-render the entire table cell.
 */
export default function tableCellRefreshHandler(model, editing) {
    const differ = model.document.differ;
    // Stores cells to be refreshed, so the table cell will be refreshed once for multiple changes.
    const cellsToCheck = new Set();
    for (const change of differ.getChanges()) {
        const parent = change.type == 'attribute' ? change.range.start.parent : change.position.parent;
        if (parent.is('element', 'tableCell')) {
            cellsToCheck.add(parent);
        }
    }
    for (const tableCell of cellsToCheck.values()) {
        const paragraphsToRefresh = Array.from(tableCell.getChildren())
            .filter(child => shouldRefresh(child, editing.mapper));
        for (const paragraph of paragraphsToRefresh) {
            editing.reconvertItem(paragraph);
        }
    }
}
/**
 * Check if given model element needs refreshing.
 */
function shouldRefresh(child, mapper) {
    if (!child.is('element', 'paragraph')) {
        return false;
    }
    const viewElement = mapper.toViewElement(child);
    if (!viewElement) {
        return false;
    }
    return isSingleParagraphWithoutAttributes(child) !== viewElement.is('element', 'span');
}
